No
Check start relay and its connector
Yes
Is start relay normal?
No
Check input power and its terminal
Yes
Is R.S.T power input normal?
No
Check or replace IPM and
DC link capacitor
Yes
Is DC link voltage normal?
Check or replace inverter PCB
Failure Checking Method
Fault diagnosis and Trouble shooting guide
23
Error Item
Error
Display No.
Major Error Occurrence CauseMeaning
DC link voltage for
inverter
compressor drive
DC link voltage is not
charged after relay on
• Loose DC link terminal
• Defective start relay
• Defective capacitor
• Abnormal power input
• Defective IPM
• Failure of voltage detection circuit
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